期刊
LIGHT-SCIENCE & APPLICATIONS
卷 7, 期 -, 页码 -出版社
CHINESE ACAD SCIENCES, CHANGCHUN INST OPTICS FINE MECHANICS AND PHYSICS
DOI: 10.1038/lsa.2017.158
关键词
chiral; dielectric; extrinsic chirality; metasurface; optical activity
类别
资金
- Air Force Office of Scientific Research (MURI) [FA9550-14-1-0389, FA9550-16-1-0156]
- Thorlabs Inc.
- King Abdullah University of Science and Technology [OSR-2016-CRG5-2995]
- Ministry of Science and Technology, Taiwan [104-2917-I-564-058]
- National Research Foundation, Prime Minister's Office, Singapore under Competitive Research Program (CRP) [NRF-CRP15-2015-03]
- National Science Foundation [1541959]
The strong optical chirality arising from certain synthetic metamaterials has important and widespread applications in polarization optics, stereochemistry and spintronics. However, these intrinsically chiral metamaterials are restricted to a complicated three-dimensional (3D) geometry, which leads to significant fabrication challenges, particularly at visible wavelengths. Their planar two-dimensional (2D) counterparts are limited by symmetry considerations to operation at oblique angles (extrinsic chirality) and possess significantly weaker chiro-optical responses close to normal incidence. Here, we address the challenge of realizing strong intrinsic chirality from thin, planar dielectric nanostructures. Most notably, we experimentally achieve near-unity circular dichroism with similar to 90% of the light with the chosen helicity being transmitted at a wavelength of 540 nm. This is the highest value demonstrated to date for any geometry in the visible spectrum. We interpret this result within the charge-current multipole expansion framework and show that the excitation of higher-order multipoles is responsible for the giant circular dichroism. These experimental results enable the realization of high-performance miniaturized chiro-optical components in a scalable manner at optical frequencies.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据